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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef3c1dffad42ef90f653ec8e02f6b881a8e49d912f1c7e5f4b6a4e40bc6241c' 
  AND token = 'aYp8fPlooWsdciEYXMbtQISsxNQvOsWCwR2x0iC2RjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}